Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.

It’s dangerous to swim here. Look at the sign!—Oh, I _______ it.

students’ eyes, Mrs Smith is a mothermore than a teacher. shetreats the students just like her own children.

I’s ________ of Bob to do a disappearing act just when there’s work to be done!

The milk____ _strange .but it suits me_______.